Electrochemical behaviors of copper/manganese-doped ceria cermet as a fuel electrode for high-temperature solid oxide cells

The metal-ceramic composite Cu/Ce0.9Mn0.1O2-delta (Cu/CMO) is investigated as a fuel electrode for solid oxide cells (SOCs) regarding the interconversion between CO and CO2, and exhibits excellent anti-carbon and electrocatalytic performance. When the SOCs are operated in solid oxide fuel cell (SOFC) mode in CO2/CO = 50/50 atmosphere, the maximum power densities of the SOCs are 37, 88, and 151 mW/cm(2) at 700, 750, and 800 degrees C, respectively, indicating that Cu/CMO electrode possesses excellent catalytic activity for CO oxidation. The Cu/CMO is also electrochemically active for CO2 reduction when the SOCs are operated in solid oxide electrolytic cell (SOEC) mode. At an applied voltage of 2.0 V, the current densities of the SOCs are 0.47, 0.87, and 1.36 A/cm(2) at 700, 750, and 800 degrees C, respectively. Short-term durability measurement of CO2 electrolysis at various applied voltages shows that the SOCs is stable with only a small decrease in current density at 1.4 V, while the current density decreases more above 2.0 V, probably due to the deterioration of the electrode at high applied voltages. Long-term stability measurement of the SOCs at an applied voltage of 1.4 V for up to 200 h shows significant stability of the electrode. [GRAPHICS] .

Automated summary

The metal-ceramic composite Cu/Ce0.9Mn0.1O2-delta (Cu/CMO) is investigated as a fuel electrode for solid oxide cells (SOCs) and shows excellent anti-carbon and electrocatalytic performance. It exhibits excellent catalytic activity for CO oxidation and electrochemical activity for CO2 reduction, indicating its potential application in solid oxide fuel cells (SOFCs) and solid oxide electrolytic cells (SOECs). The electrode also demonstrates significant stability in both short-term and long-term durability measurement.